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no Model.) 2 Sheets-Sheet 1. S. W. JAMISON. LEATHER GRIMPING MACHINE.

No. 457,200. Patented Aug. 4, 1891..

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(No Model.) I 2'Sheets-Sheet 2.

S. W. JAMISON.

LEATHER GRIMPING MACHINE. No. 457,200. Patented Aug. 4, 1891.

" UNITED STATES PATENT OFFICE.

SAMUEL V. JAMISON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE S. IV.JAMISON BOOT AND SHOE CRIMPING MACHINE COMPANY, OF

NEW YORK, N. Y.

LEATHER -CRIMPING MACHINE.

SPECIFICATION forming partof Letters Patent No. 457,200,. dated August4, 1891.

Application filed May 4, 1891- Serial No. 391,482. (No model.) 7

To all whom it may concern.-

Be it known that I, SAMUEL W. J AMISON, a resident of Boston, county ofSuffolk, and State of Massachusetts, have inventeda new and usefulImprovement in Leather-Crimping Machines, which improvement is fully setforth in the following specification.

This invention relates to the construction of machines for crimpingleather to form the uppers of boots and shoes-such, for example, asshown and described in patents heretofore granted to me. It hasparticular reference to that form of machine which is described inLsestters Patent N 0. 303,018, dated August 5, 1 I. The presentinvention comprises certain improvements in details of constructionwhich have been found of practical value and which can most convenientlybe described in connection with the accompanying drawings, in whichFigure I is a front elevation of the entire machine, part of one of theside frames being broken away. Fig. II is a side view. Fig. III is a topview of one of the turrets and slides, and Fig. IV is a detail of thebushing for the screw-shafts.

Ais the pedestal ,B, the upright side frames supported thereon; C, thetrucks sliding vertically on ways of said frame; D, crimping-jaws; E,the smoothing-jaws; F G, the turrets carried by trucks C; H and I, theslides or caps carrying the crimping and smoothing jaws, respectively;K, the levers for forcing out the lower or crimping jaws; L, the barspivotally connected by means of links 9 with the side frames for actingon levers K when moved downward by pedal-lever P and rock-shaft M; N,the crimping form or tree, and S the screwshafts for reciprocating thetrucks. These parts, being in general constructed and operating asdescribed in the above mentioned Letters Patent, will require nodetailed explanation.

Heretofore the caps II I, which slide on the turrets F Gr and carry thejaws D E, were held from turning on their turrets by means of a smallpin passing through a lug or car on the cap. The upper side I wasactuated through a yoke or cross'piece sliding in grooves of the saidframe and the lower slides H by the levers K, already referred to. Inthe work ing of these parts inconvenience was encountered by reason ofthe tendency of the slides to tilt or work one-sided, thus deflectingthe jaw out of the proper plane and causing it to press unequally, andby reason, also, of the tendency of the yoke of the upper turrets totwist axially. These difficulties in the mounting and operation of thejaws are overcome by the present invention.

As shown in Fig. III, each cap or slide is provided with two ears I),projecting on opposite sides thereof, and through holes in these carspass loosely the screw-pins or bolts 9. By this arrangement the slidingmotion.

of the caps is made even and regular.

The cross-bar H, Figs. I and II, which imparts motion to the upper orsmoothing jaws E, has at each end a friction-roller 'i, which at theproper moment are moved outward to open the jaws by means of thestationary cams 71:. As the trucks move up and down, the caps I arelikely to twist in case one roller '11 becomes dry and works harder thanthe other or in case the cams are not accurately set,'or for. some otherreason. To prevent this, a grooved clamp I is secured to the upper lug mof the truck and embraces yoke h on one side of its center. It preventsthe twisting of the latter without interfering with the freedom of itsreciprocating motion. The actuating feedlever K, which is pivoted to thetruck and transmits to the slides H the motion of bar L, is now providedwith a friction-roller 11, whose width is equal to that of bar L. Thisconstruction is important for the reason that heretofore the roller cutinto the bar and the wear on the latter was excessive and uneven,causing lost motion and uncertainty in the operation of the lower jaws.The said lever K has also another friction-roller 0, which bears on theplungerof the slide, which further diminishes wear and lost motion intheseparts and conduces to greater ease of movement.

I have found it necessary in this machine to enlarge the diameter of thescrew, and to insure requisite steadiness in operation and prevent thebushing coming loose by the back -and-forth movement of the screw I haveconstructed the bearing of the screwshaft as shown in Fig. 1V. Prepresents the casting of the frame, in which a chamber of proper sizeis formed. In this chamber, which is provided with ribs 19, 0f dovetailform, is set the composition or other bushing q, also provided withdove-tail ribs r, which lie be tween the ribs 19, leaving sufficientspace to babbitt the bushing in the casting.

The improvements described herein maybe used separately withoutdeparting from the spirit of the invention.

Having now fully described my said invention, what I claim is 1. Thecombinatiomwith the movable trucks and the jaws of the turrets on saidtrucks, slides carrying each one of the smoothi ng-j aws and working onsaid turrets, a yoke or crossbar for each slide having at its endsfrictionrollers working in grooves in the frame, stationary cams foractuating said slides, and a hook or grooved clamp embracing said yoke,but permitting it to move in and out, substantially as described.

2. The combination of a movable truck, the slides carrying the crimpingand smoothing jaws and provided each with two lugs, holding-pins passingthrough said lugs and secured to the slide, the yoke and frictionrollersfor the upper slide, the holding-clamp embracing said yoke, and means,as specified, for reciprocating both of said slides, substantially asdescribed.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

S. JAMISON.

